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Scan the QR code to open CycleSync on any device — then share it with a friend.
Point your camera here → opens instantly
CycleSync is a free Chrome extension that brings menstrual cycle tracking right into your browser — track your period, predict ovulation, log symptoms, and feel truly in sync. No account needed.
No sign-up. No subscriptions. Just install and go — your data stays private on your device.
Add CycleSync to Chrome in one click. It appears instantly in your browser toolbar, ready whenever you need it.
Tell CycleSync when your last period started. That's all it needs to begin predicting your cycle and tracking your phases.
See your current phase, log symptoms daily, and get personalised tips to make the most of every part of your cycle.
Thoughtfully designed to fit quietly into your day — one click from any tab.
Always know where you are in your cycle. CycleSync shows your current phase — Menstrual, Follicular, Ovulation, or Luteal — and your progress at a glance.
A clear visual calendar showing your period days, fertile window, and ovulation — colour-coded so you can plan ahead with confidence.
Quickly log mood, energy, flow, and more. The more you track, the more CycleSync learns about your personal patterns over time.
Phase-aware tips for nutrition, exercise, focus, and self-care — tailored to what your body actually needs right now.
CycleSync stores everything locally in your browser. Nothing is sent to a server, no account is required, and no one else can see your data. Your cycle is yours alone.
Join women who use CycleSync to understand their bodies and plan their lives with clarity — all from their browser.
CycleSync is a free Chrome and Edge extension for tracking your period, cycle phases, symptoms and fertile window. No account, subscription or server-stored data required.
"Excellent calculator, my girlfriend really liked it. The design is laconic and pleasant. Everything is already intuitive."
Used organically in 10+ countries — available in 12 languages
Available in 12 languages
Our new mobile PWA brings CycleSync to your iPhone or Android. No App Store, no account, no data sharing. All 12 languages. Works offline. Add it to your home screen in seconds.
CycleSync has a free mobile web app (PWA) that works on iPhone and Android. It does not require an App Store or Google Play — just open it in your mobile browser.
Must be Safari — not Chrome or Firefox on iPhone
Visit wushu75.github.io/CycleSync/app/
The box with an arrow at the bottom of Safari
Scroll down in the share sheet to find it
CycleSync appears on your home screen like an app
Chrome gives you the automatic install prompt
Visit wushu75.github.io/CycleSync/app/
A banner appears automatically after a few seconds
If no banner appears, use the Chrome menu manually
CycleSync appears on your home screen like an app
Yes — CycleSync is completely free. No subscription, no hidden fees, no account required. If you find it useful you can optionally support development with a coffee via Ko-fi.
100% private. All your data is stored locally in your browser using Chrome's built-in storage. Nothing is sent to any server, no account is required, and your data is never shared or sold to anyone.
Yes — CycleSync works on any device that runs Google Chrome, including Windows, Mac and ChromeOS.
Yes — once you enter your last period date and cycle length, CycleSync automatically predicts your next period and ovulation date. The more you track the more accurate it becomes.
Yes — CycleSync lets you log symptoms daily including mood, energy, flow, cramps and more. This makes it useful for anyone tracking irregular cycles including those with PCOS.
Scan the QR code to open CycleSync on any device — then share it with a friend.
Point your camera here → opens instantly